Definition from ISO/CD 10303-41:1992: A unit is a physical quantity, with a value of one, which is used as a standard in terms of which other quantities are expressed.

NOTE: Select item IfcMonetaryUnit is an addition to ISO/CD 10303-41:1992.

NOTE Corresponding STEP name: unit, please refer to ISO/IS 10303-41:1994 for the final definition of the formal standard.

SELECT

• IfcNamedUnit A unit which is identified by a name.
• IfcDerivedUnit A unit which is derived from an expression of units.
• IfcMonetaryUnit A unit for defining currencies.